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Trekantstal (triangulære tal) 2
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Expression 5: "T" Subscript, "n" , Baseline equals 1 half "n" left parenthesis, "n" plus 1 , right parenthesis
T
n
=
1
2
n
n
+
1
equals
=
78
7
8
5
⇔ n ( n + 1 ) =
⇔ n ( n + 1 ) =
6
Expression 7: 2 "T" Subscript, "n" , Baseline
2
T
n
equals
=
156
1
5
6
7
Linjer
Linjer
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8
Punkter
Punkter
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22
25
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n = 12 ⇔ ¹⁄₂ n ( n + 1 ) = 78
"x"
x
"y"
y
"a" squared
a
2
"a" Superscript, "b" , Baseline
a
b
7
7
8
8
9
9
over
÷
functions
(
(
)
)
less than
<
greater than
>
4
4
5
5
6
6
times
×
| "a" |
|
a
|
,
,
less than or equal to
≤
greater than or equal to
≥
1
1
2
2
3
3
negative
−
A B C
StartRoot, , EndRoot
pi
π
0
0
.
.
equals
=
positive
+
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